What is the grammatical error in this sentence: The patient was to cold, so he asked the nurse for another blanket?

The word "to" is incorrectly used in the sentence. In this context, the correct form should be "too," which is an adverb meaning "excessively" or "more than what is acceptable." The sentence is attempting to convey that the patient was excessively cold, indicating the need for additional warmth, which is accurately described by "too." The use of "to" in this context would imply direction or a relationship, which does not fit the meaning intended in this sentence. By correcting "to" to "too," the sentence clearly communicates that the patient experienced an uncomfortable level of coldness.